Amsterdam · September · relief from the heat

Coolest places to go from Amsterdam in September

In September, the coolest well-known place within 15 hours of Amsterdam is Reykjavik, Iceland, 9.3 °C cooler than Amsterdam and 6.3 h sun a day, about 6h 12m each way by air. Without flying, it is Bergen, Norway, 4.7 °C cooler than Amsterdam, about 14h 54m each way by train, for about 19× less carbon (26.3 kg CO₂e return against 507 kg).

The 10 coolest places within 15 hours of Amsterdam

Ranked on relief from the heat in September alone, among well-known places (a Wikivoyage travel guide and at least 40,000 Wikipedia readers a year), one per area and at most three per country. The carbon is shown, not used to choose: the list further down is the other question, how much relief from the heat each extra kilogram buys.

Reykjavik, Iceland9.3 °C cooler · 6.3 h sun a day · 3.5 mm rain a day · sea 10.8 °Cair ≈ 6h 12m · 507 kg CO₂e return
Tromsø, Norway7.1 °C cooler · 4.9 h sun a day · 5.2 mm rain a dayair ≈ 6h 12m · 516 kg CO₂e return
Östersund, Sweden6.1 °C cooler · 7.7 h sun a day · 2.6 mm rain a dayair ≈ 5h 18m · 335 kg CO₂e return
Bodø, Norway5.9 °C cooler · 5.2 h sun a day · 6.6 mm rain a day · sea 13.0 °Cair ≈ 5h 48m · 437 kg CO₂e return
Rovaniemi, Finland5.6 °C cooler · 6.0 h sun a day · 3.5 mm rain a dayair ≈ 6h 6m · 489 kg CO₂e return
Trondheim, Norway5.0 °C cooler · 7.0 h sun a day · 5.8 mm rain a dayair ≈ 5h 12m · 320 kg CO₂e return
Sundsvall, Sweden4.5 °C cooler · 8.4 h sun a day · 2.3 mm rain a day · sea 14.2 °Cair ≈ 5h 18m · 336 kg CO₂e return
Luleå, Sweden4.5 °C cooler · 7.7 h sun a day · 2.4 mm rain a day · sea 14.3 °Cair ≈ 5h 48m · 442 kg CO₂e return
Dundee, United Kingdom4.4 °C cooler · 7.7 h sun a day · 2.0 mm rain a day · sea 13.9 °Crail ≈ 13h 12m · 57.3 kg CO₂e return
Glasgow, United Kingdom3.8 °C cooler · 7.2 h sun a day · 3.4 mm rain a dayrail ≈ 11h 54m · 55.2 kg CO₂e return

Without flying

The coolest places the train reaches within 15 hours. Bergen is 4.7 °C cooler for 26.3 kg — about 19× less carbon than flying to Reykjavik.

Bergen, Norway4.7 °C cooler · 6.5 h sun a day · 8.8 mm rain a day · sea 15.6 °Crail ≈ 14h 54m · 26.3 kg CO₂e return
Dundee, United Kingdom4.4 °C cooler · 7.7 h sun a day · 2.0 mm rain a day · sea 13.9 °Crail ≈ 13h 12m · 57.3 kg CO₂e return
Inverness, United Kingdom4.3 °C cooler · 7.3 h sun a day · 2.9 mm rain a dayrail ≈ 15h · 68.0 kg CO₂e return
Aberdeen, United Kingdom4.0 °C cooler · 8.4 h sun a day · 1.6 mm rain a day · sea 13.4 °Crail ≈ 14h 24m · 62.0 kg CO₂e return
Glasgow, United Kingdom3.8 °C cooler · 7.2 h sun a day · 3.4 mm rain a dayrail ≈ 11h 54m · 55.2 kg CO₂e return
Haugesund, Norway3.5 °C cooler · 7.8 h sun a day · 6.8 mm rain a day · sea 15.8 °Crail ≈ 13h 18m · 23.1 kg CO₂e return

≈ is the model's estimate (air times include getting to and through the airport); ✓ is a rail journey checked against a real timetable, with the date it was checked. Temperatures are historical daily means for 2023–2024, averaged across day and night, so afternoons run warmer.

The low-carbon trade-off

The coolest place you can reach from Amsterdam in September within 15 hours is Reykjavik, 9.3 °C cooler, costing 507 kg CO₂e return. The lowest-carbon option is La Chaux-de-Fonds at 17.8 kg — 28× less carbon, for 6.6 degrees less relief from the heat.

Every destination here is on the efficiency frontier: nowhere else this site covers is both cooler in September and lower in carbon. Anything a better option beats outright has been left out.

Where they are. Solid lines are rail or ferry, dashed are flights, from Amsterdam. Pick one to compare.

By rail or ferry By air

Carbon against relief from the heat, September, departing Amsterdam. Journeys of up to 15 hours each way.

What the 15-hour limit costs: at this budget Östersund can only be reached by air — 335 kg CO₂e, in 5h 18m. Allow up to 24 hours and the train does the same journey for 39.2 kg in 21h 12m — 9× less carbon for 15h 54m more travelling.

September from Amsterdam — 5 destinations on the frontier, 3 without flying.
Destination	How	CO₂e return	Temp	Sun/day	Rain/day	Journey
La Chaux-de-Fonds, Switzerland	Rail	17.8 kg	14.1 °C	9.2 h	3.5 mm	10h 42m
Haugesund, Norway	Rail	23.1 kg	13.3 °C	7.8 h	6.8 mm	13h 18m
Bergen, Norway	Rail	26.3 kg	12.1 °C	6.5 h	8.8 mm	14h 54m
Östersund, Sweden	Air	335 kg	10.7 °C	7.7 h	2.6 mm	5h 18m
Reykjavik, Iceland	Air	507 kg	7.5 °C	6.3 h	3.5 mm	6h 12m

Warm is not the same as pleasant, which is why sunshine and rainfall are shown alongside temperature. All three are ERA5 monthly means for 2023–2024.

Where the curve breaks

The frontier is gentle until it isn't. Going from Bergen (26.3 kg, 4.7 °C cooler) to Östersund (335 kg, 6.1 °C cooler) buys 1.4 °C more relief from the heat for an extra 308 kg — 220 kg of CO₂e per degree. That single step is the most expensive relief from the heat on the whole curve.

The pick of them

La Chaux-de-FondsSwitzerland17.8 kg CO₂e return14.1 °C · 9.2 h sun · 10h 42m by railmild and bright

BergenNorway26.3 kg CO₂e return12.1 °C · 6.5 h sun · 14h 54m by railmild but wet

ReykjavikIceland507 kg CO₂e return7.5 °C · 6.3 h sun · 6h 12m by aircool

The same month, asked differently

September answers differently depending on what you are after, and the lists genuinely diverge: the brightest places are not the hottest, and in summer the useful question stops being where is warm at all.

Where to stay in Reykjavik

Places to stay in Reykjavik, Iceland, on a live map. Prices and availability come from Stay22 and its booking partners.

Search places to stay in Reykjavik →Opens the booking search in a new tab. Same partners as the map below.

Affiliate disclosure. A booking made through this map may earn 0xCarbon a commission, at no extra cost to you. It changes nothing above it: the emissions figures come from UK Government conversion factors and are computed before anyone is paid anything.See the method.

Other months from Amsterdam

September from elsewhere

Photo credits

Bergen: W. Bulach, CC BY-SA 4.0, via Wikimedia Commons
Reykjavik: Hedwig Storch, CC BY-SA 3.0, via Wikimedia Commons
Tromsø: Diego Delso, CC BY-SA 4.0, via Wikimedia Commons
Östersund: Lars Falkdalen Lindahl (User:Njaelkies Lea), CC BY-SA 3.0, via Wikimedia Commons
Bodø: Røed 20:41, 24 July 2006 (UTC), CC BY-SA 2.5, via Wikimedia Commons
Trondheim: Åge Hojem/Trondheim Havn from Trondheim, Norway, CC BY-SA 2.0, via Wikimedia Commons
Sundsvall: User:Ö1thpe0807 (image 1), User:I99limpan (image2), User:Larskallin (image3), Hans Lindqvist (image 4-5), Calle Eklund (, CC BY-SA 3.0, via Wikimedia Commons
Luleå: Andreas Harnemo, CC BY-SA 3.0, via Wikimedia Commons
Dundee: File:442 dundee header.png (Tay Bridge and RSS Discovery images):- Original: PlutosAcademy File:V&A Dundee Near Completi, CC BY-SA 4.0, via Wikimedia Commons
Glasgow: 瑞丽江的河水, CC BY-SA 4.0, via Wikimedia Commons
Aberdeen: Ragazzi00, CC BY-SA 3.0, via Wikimedia Commons
Haugesund: Efarestv, CC BY-SA 3.0, via Wikimedia Commons

Questions

Where is the coolest place to go from Amsterdam in September?

Reykjavik, Iceland, at 9.3 °C cooler. Reaching it emits 507 kg CO₂e return, travelling 6h 12m each way by air (modelled).

Can I get somewhere cool from Amsterdam in September without flying?

Yes. Bergen reaches 4.7 °C cooler and is reachable by rail or ferry in 14h 54m (modelled), emitting 26.3 kg CO₂e return — though Reykjavik is cooler still, if you fly.

How much carbon does a return trip from Amsterdam to Reykjavik produce?

507 kg CO₂e for one person, return, by air. That uses the UK Government's 2026 conversion factors, including radiative forcing for flights.

Carbon uses UK Government (DESNZ/DEFRA) 2026 conversion factors applied to great-circle distance, with radiative forcing included for flights. Rail journey times are modelled estimates, not timetabled services. Full method · download the data.